^2x, then last time|-------------------------------------------||-------------------------------------------||-------------------------------------------||-------------------------------------------||-4-3-4-7777-4-3-4-6666-4-3-4-7777-88886666-||-2-1-2------2-1-2------2-1-2---------------|

^2x, then last time|-------------------------------------------||-------------------------------------------||-------------------------------------------||-------------------------------------------||-2-3-5-7777-2-3-5-6666-2-3-5-7777-88886666-||-0-1-3------0-1-3------0-1-3---------------|